1266164221 has 8 divisors (see below), whose sum is σ = 1448977664. Its totient is φ = 1083834000.

The previous prime is 1266164203. The next prime is 1266164227. The reversal of 1266164221 is 1224616621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266164221 - 2¹¹ = 1266162173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266164227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115170 + ... + 125683.

It is an arithmetic number, because the mean of its divisors is an integer number (181122208).

Almost surely, 2^1266164221 is an apocalyptic number.

It is an amenable number.

1266164221 is a deficient number, since it is larger than the sum of its proper divisors (182813443).

1266164221 is an equidigital number, since it uses as much as digits as its factorization.

1266164221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241611.

The product of its digits is 6912, while the sum is 31.

The square root of 1266164221 is about 35583.2013877335. The cubic root of 1266164221 is about 1081.8407739451.

The spelling of 1266164221 in words is "one billion, two hundred sixty-six million, one hundred sixty-four thousand, two hundred twenty-one".